LatentConcat - ComfyUI Built-in Node Documentation

Complete documentation for the LatentConcat node in ComfyUI. Learn its inputs, outputs, parameters and usage.

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The LatentConcat node combines two latent samples along a specified dimension. It takes two latent inputs and concatenates them together along the chosen axis (x, y, or t dimension). The node automatically adjusts the batch size of the second input to match the first input before performing the concatenation operation.

Inputs

Parameter	Data Type	Required	Range	Description
samples1	LATENT	Yes	-	The first latent sample to concatenate
samples2	LATENT	Yes	-	The second latent sample to concatenate
dim	COMBO	Yes	"x" "-x" "y" "-y" "t" "-t"	The dimension along which to concatenate the latent samples. Positive values concatenate samples1 before samples2, negative values concatenate samples2 before samples1

Note: The second latent sample (samples2) is automatically adjusted to match the batch size of the first latent sample (samples1) before concatenation.

Outputs

Output Name	Data Type	Description
output	LATENT	The concatenated latent samples resulting from combining the two input samples along the specified dimension